<template>
    <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '65px' : '180px' ">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" 
        active-text-color="#409EFF" :unique-opened="true" :collapse="isCollapse" 
        :collapse-transition="false" :router="true" :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index ="item.id+''" v-for="item in menuList" :key='item.id'>
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconList[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subitem.path " v-for="subitem in item.children" :key="subitem.id" @click="saveNavState('/'+subitem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subitem.authName}} </span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    //生命周期函数，页面加载的时候调用
    created(){
        this.getMenuList();
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods:{
        logout(){
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
       async getMenuList(){
            const {data:res} = await this.$http.get('menus')
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg)
            }
            this.menuList = res.data;
        },
        toggleCollapse(){
            this.isCollapse = !this.isCollapse;
        },
        saveNavState(path){
            window.sessionStorage.setItem('activePath',path)
        }
    },
    data(){
        return{
           menuList :[

           ],
           iconList:{
               '125':'iconfont  icon-users',
               '103':'iconfont icon-tijikongjian',
               '101':'iconfont icon-shangpin',
               '102':'iconfont icon-danju',
               '145':'iconfont icon-baobiao'
           },
           isCollapse:false,
           activePath:''
        }
    }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>